Retractable lashing or like attachment device



Jan. 3, 1956 H. MAYNARD RETRACTABLE LASHING OR LIKE ATTACHMENT DEVICEFiled July 3, 1953 FIG. 4.

FIG. 6.

FIG. 2

United States Patent 2,729,418 a RETRACTABLE LASHING R LIKE ATTACHMENTDEVICE Harry Maynard, Hull, England, assignor to Blackburn and GeneralAircraft Limited, Brough, East Yorkshire, England, a British companyApplication July 3, 1953, Serial No. 366,025

4 Claims. (Cl. 248361) This invention relates to lashing or likeattachment devices and is particularly concerned with such connect ingdevices for use in making a separable connection to the floor or wall ofa compartment of an aircraft or other movable vehicle for the purpose ofproviding an anchorage for a lashing or the securing means for afiixinga structure such as a chair and so forth.

Now the principal object of the present invention is to provide aretractable device which may be displaced to lie flush or substantiallyflush with the ambient surface or extended to project thereabove so thata lashing or other member to be held against displacement may read ilybe connected thereto.

A further object of the invention is to provide such a device in whichdanger of damage, due to inadvertent retraction of the attachment memberby an externally applied force (such as the wheel of a vehicle passingthereover) is eliminated.

The device, according to the present invention, comprising a springloaded attachment member which is capable of limited axial displacementin a holding mem her with means operable on partial rotation of theattachment member to hold it against the action of the spring inretracted position with its end flush or substantially flush with theend of the holding member.

Further, according to' the present invention, the retractable attachmentmember on retraction and partial rotation latches with a displaceablespring loaded member.

The holding member is suitably secured with its end flush with theambient surface, i. e., extending through a floor or wall to lie flushwith the exposed surface thereof, so that when the attachment'member isretracted the floor or wall has an unencumbered surface. To render thedevice operative the attachment member is partially rotated and soreleased that its spring will cause it to project to its maximumpermitted extent for the connection of. a lashing or other means theretoas by engaging in an aperture in the projecting portion of such member.7

The attachment member is conveniently held in its retracted position byforming bayonet joint slots in the inner end thereof and by providing atransverse rod across the holding member with which such slots mayengage. When the transverse rod is displaceably mounted and under springloading, any inadvertent retraction of the attachment member with thebayonet-type slots not aligned with the rod with which they engage, theend of that member will merely bear on and displace such rod withoutcausing any damage.

A screwdriver slot or the equivalent is provided in the exposed end ofthe attachment member to facilitate the turning thereof by means of atool or a coin.

In order that the invention may be clearly understood and readilycarried into etfect, embodiments thereof are by way of example,hereinafter more fully described with reference to the accompanyingdrawings, which are given for purposes of illustration only and not oflimitation.

In these drawings:

to Figs. 1 and 2 thereof, the device comprises a tubular holding member1 which as shown may be formed with attachment lugs 2 by means of whichit may be secured to the structure with its end extending through to lieflush with the exposed surface of a floor or wall 3 indicated by brokenlines. The member 1 is formed with a bore in -two diameters of which thelarger is innermost.

The attachment member 4 is a part tubular circular section member whichhas an external annular flange 5; This member is mounted for slidingmovement on the smaller diameter bore of the member 1 with its flange 5in the larger diameter bore thereof.

A compression spring 6 is disposed in the tubular position of the member4 to be effective on the end of such portion and on a part 7 whichtelescopes therein. The part 7 is held in place by a transverselyextending rod 8 carried at the end of the holding member 1.

The rod 8 also forms part of the means for holding the attachment member4 in retracted position. Thus the inner end of the tubular portion ofthat member 4 is providedwith bayonet joint slots 9 which may engage therod 8 and hold the member 4 retracted against the action of the spring6, as shown in Fig. 1, after linear displacement and partial rotation ofthe member 4.

The exposed end of the member 4 is provided with a screw driver slot 10or the equivalent to facilitate the turning thereof by a tool or coin.The portion of the member 4 which projects is also provided with anaperture 11 in which may engage a lashing or a bolt for securing somestructure as a chair.

To render the device effective it is only necessary to the spring 6 willcause that member to project from the holding member 1 to an extentlimited by the annular flange 5 engaging the abutment between the boresin the holding member 1 as shown in Fig. 2.

When the device described above is used in a floor, there is danger thatthe inadvertent retraction of the attachment member 1 due to anexternally applied force, such asthe wheel of a vehicle passingthereover or a mass dropping thereon, might result in the inner end ofthe attachment member 4 striking the rod 8 and so damaging the rod orbeing damaged thereby. An alternative construction inwhich this dangeris eliminated is hereafter described with reference to'Figs. 3 to 6of'the drawings.

This device is essentially similar and comprises an attachment member 12which is likewise axially displaceable in a holding member 13, the lowerend of which is closed off by a part 15. The part 15 has an externalflange 16 between which and the end of the guide portion of the part 14is a spring 17. The part 15 carries a transversely extending pin 18which extends through slots 19 in the guide portion of the part 14, andthis part 14 is formed with an external flange 20 between which and theend of the bore in the attachment member 12 is a spring 21, which tendsto move the attachment member 12 outwardly to its extended position, asin Figs. 3 and 4 when its movement is limited by an external peripheralflange 12 abutting the stop formed by he reduction in the bore of theholding member 13.

Bayonet joint slots 22 extend in from the inner end of the attachmentmember 12 and the arrangement is ain. $219 th t h ait hl d a attthtn ofth tt t thhh hst 1% a ainst tht p in 2 tha ah; is. will a te he lats 2.2and h Pa tial e hh hi th tt s ttthh member 12, efiectively hold thatmember in retracted phs ihh th tt ite a d flu w th the a i h holdingmember 13. Should the attachment member 112 e tt fah l in ah @593? P -stih hthta' n a i which thepin 18 can enter the slots 22, the inner end it h tr w l thshae h hil a i h i titsplace the same and the tubular part15 against the t at i s hrih 1,71 h lh h r -ti t9 t tsh the a ththt imtth st 1. i i whated as h t s lhtie t me tht te i hti e- Ph li w l h tthe 9 W h h spring 7 wi mh h hhhlhr thethha 15 iii r vh h d re t f ths Pih to i he sla 22 wharthh e h h n ag ment can. he w nd ed y f ltt et' aral rhta h i ll a taqh eme; indicated by the arrow in Fig, The attachmentmemt 1. has i l is ha a t h hqv led. th an e he ui 'l iii wh c ma ths aa shack a h h t or hthtr th ih hh hh and t h thh i ls pihv t t with a51611124 in which a coin or tool may engage t9 facilitate rotation ofthe attachment member.

h P ma h th t n qqhv htith y fgr example m the manner illnstrated' bysecuring it to a ba 2 nd at w h thter slots hi he and of the holdingmember 13, which bar 2 is secured by a Cit-Clip gi awhi e thtthtd innerwall of the member 13.

What I claim is;

ll A retractable lashing and like attachment device, lP 8 a hh li sh'tthht a ing a hht there n a P tt hh t t at a h n ht h t axially s idale nd o a e: in w l bore a t t c htr car i t the. end of said holdingmember, a spring-loaded member l hl tt h i' hi h i in, Sa g d member aan versely extending rod carried y said spring-loaded dis- P 9 i me behhht ih l s n h thhh a e d f said t t t h nt hhthh h h h Q en agin i hsaid rojdfa spring disposed between the end of the tubular portion ofsaid attachment member and said guide memher h t hd to u a h hm 1 l lli2hthi s thtltt p ra PQ li h a d me n for l m i he movement of saidattachment memher in its extended position.

'A fetrhctablh t m n t hv stz hi h chmnr shs, in combination: a holdingmember formed with a cyiin ith h t her n n tta hmen m m ha in a portionthereof of tubular form, said attachment member being both axiallyslidable and rotatable in said bore in said holding member; a guidemember formed with an axially-extending cylindrical bore and an externalflange, said guide member being supported at the lower end of saidholding member; a displaceable member mounted in said bore in said guidemember for axial movement there h; a Spring S r ndi hhtt O h t tli nacsa l mmher urging said displaceable member outwardly in said bore,away from said external flange of said guide memher; a transverselyextending rod carried by said displaceable member; bayonet joint slotsformed in the tubular end portion of said attachment member, said slot sbeing capable of engaging said transversely extending rod; a springaxially positigned in said tubular portion of said attachment memberbetween the end thereof and said guide member, said spring tending tourge said attachment member outwardly, away from said guide member, intoits extended operative position; and means associated with said holdingmember for limiting outward movement of said attachment member into itsextended operative position.

3. A retractable attachment device as defined in claim 2, wherein slotsare provided in said guide member to permit said transversely extendingr d to, extend thererhhslt-- 4- A. thttattahlt a tah h en d ce hi h pris, n thihhinatiqht h ldi m m r o m d wi h a, l ndrical here therein; anattachment member partly of h hlat ql' h t is! a ta hmhht em r b i bo xill slidable and rotatable in said hore in said holding meme hhtl ei gPip i t d Wi ay h joi l ts in the hhh ar t tl PQ l thh ht; a gu em orm wth, an ai ih lt-txtth h yl n ica e and n n l iaise. a u de m mb r h in pt d at t hws and, f said hhltlihg e er; a p teab m ber mounted in saidbore in said guide member for axial movement therein; a springsurrounding part of said lisnlace thlq t ih sitls sa pl t lc th mhe Y t!id hate. away f om a d h hr l f an e of sa d guide member; atransversely extending rod carried by said displaceable member, said rodbeing adapted he thshss i said b y n t ot in. a at chm h hht s a h ihs hsi ly po iti n d n i tubular p tigtt (if attachment member, between theend thereof l?! aid shi l lhti t aid Spring n n to urge d att ts h shtihthihtt qh wa w from d guide at-he i it tt tli l h t ht v P i i m an onsaid holding memher cooperating with means on said t huiai; pgrtion ofsaid attachment member for limiting outward movement of said attachmentmember into its xt ndsl qhttht t nhsi hh an me including a b suppqrtingthe lower end of said guide member, and slots to receive the ends ofsaid bar formed in said holding memhql, l b ly Said guide member issupported at the wer h i l t aid qltlih mtimbelit lttttteht s Qithl inthe file f thi.S Patent UNlTED ST T S T ENTS

